It's been licensed by Sentai - but I haven't heard anything about a second season. The BluRay sales for BTOOOM! looked like they were pretty bad, and if they don't sell a new season is pretty unlikely.
I'll double check the figures though.
[EDIT] Confirmed - sales for the series were dismal. Also - it seems that there's a shortage of material - the series went up to about Chapter 50 of the manga, and there are currently about 70 chapters - BTOOOM! is serialised in a monthly magazine. So it would be ages before there's enough material for another season.
But the sales are what make or break sequel decisions - if a series doesn't break even (and by the looks of things BTOOOM! didn't) there's very little chance of a sequel.





